Auto focus method and electric device using the same

Details Auto focus method and electric device using the same Auto focus method and electric device using the same

2006-06-26

2010-06-15

Chan, Jason (Department: 2622)

Television

Camera, system and detail

Optics

Reexamination Certificate

active

07738027

ABSTRACT:
An auto focus method. A step length for a driving motor and a track length are defined and a storage medium is provided. The driving motor is shifted to an initial position and the storage medium is cleaned. The driving motor sequentially shifts a focus lens to a plurality of sampling positions based on the step length. A plurality of evaluation values corresponding to each sampling position and a plurality of step lengths corresponding to each evaluation value for a desired image are recorded in the storage medium. A weighted average is calculated according to the evaluation values and the step lengths recorded in the storage medium using a statistical formula. The driving motor shifts the focus lens to a focus position according to the weighted average.

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